This shampoo claims to strengthen and liven up dry, brittle, limp hair. It delivers. Root 66 uses coconut- and sea salt–based cleansers to scrub thoroughly. It also contains horsetail, a plant that’s packed with silica, a mineral known to promote hair growth and keep strands strong. The thin, clear gel has a faint fruit fragrance, lathers up well for complete coverage, and rinses out easily. Tip: The bottle is wider and heavier at the bottom than at the top, so when you tip it over to squirt shampoo into your hand, be sure to squeeze gently or you’ll accidentally get a huge handful—about three times as much as you need. [$7.95, 8.5 oz.; giovannicosmetics.com]